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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5017) Allow sharding based on the value of a field
Date Tue, 09 Jul 2013 19:03:49 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703653#comment-13703653
] 

Yonik Seeley commented on SOLR-5017:
------------------------------------

bq. the _shard_ parameter is the actual name of the shard.

For the implicit router.  For a hash based router, it should be the value that is hashed to
then lookup the shard based on ranges.

bq. In case of compositeId router , I would like to read the part before the (!) to be read
from the 'shardField'.

I think it should work simpler... _shard_ is used as the whole value to hash on for any hash
based router.
It's simple - if you want to have doc B have the exact same hash as doc A, then you give _shard_=A
when adding doc B.

bq. I would like to read the part before the (!) to be read from the 'shardField'.

Perhaps that should be a different router... compositeField rather than compositeId.

                
> Allow sharding based on the value of a field
> --------------------------------------------
>
>                 Key: SOLR-5017
>                 URL: https://issues.apache.org/jira/browse/SOLR-5017
>             Project: Solr
>          Issue Type: Sub-task
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>
> We should be able to create a collection where sharding is done based on the value of
a given field
> collections can be created with shardField=fieldName, which will be persisted in DocCollection
in ZK
> implicit DocRouter would look at this field instead of _shard_ field
> CompositeIdDocRouter can also use this field instead of looking at the id field. 

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